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| 型号： | MAX6363PUT46-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC CIRC SUPERVISORY LP SOT23-6 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 150 ms |
| 电压 - 阀值： | 4.63V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-6 |
| 包装： | 带卷 (TR) |
SOT23, Low-Power μP Supervisory Circuits
with Battery Backup
Operating Circuit, the MAX6362 monitors two supply
voltages. To monitor the secondary 5V logic or analog
supply with a 4.60V nominal programmed reset thresh-
old, choose R2 = 100k ? , and calculate R1 = 273k ? .
Reset Output
A μP’s reset input starts the μP in a known state. The
MAX6361–MAX6364 μP supervisory circuits assert a
reset to prevent code-execution errors during power-
up, power-down, and brownout conditions. RESET is
guaranteed to be a logic low or high depending on the
device chosen (see Ordering Information). RESET or
RESET asserts when V CC is below the reset threshold
and for at least 150ms (t RP ) after V CC rises above the
reset threshold. RESET or RESET also asserts when MR
is low (MAX6361) and when RESET IN is less than
1.235V (MAX6364). The MAX6362 watchdog function
will cause RESET (or RESET ) to assert in pulses follow-
ing a watchdog timeout (Figure 1).
Applications Information
Operation Without a Backup
Power Source
The MAX6361–MAX6364 were designed for battery-
backed applications. If a backup battery is not used,
connect V CC to OUT and connect BATT to GND.
Replacing the Backup Battery
If BATT is decoupled with a 0.1μF capacitor to ground,
the backup power source can be removed while V CC
remains valid without danger of triggering a reset pulse.
The device does not enter battery-backup mode when
V CC stays above the reset threshold voltage.
Negative-Going V CC Transients
These supervisors are relatively immune to short-dura-
tion, negative-going V CC transients. Resetting the μP
when V CC experiences only small glitches is usually
not desirable.
The Typical Operating Characteristics section shows a
graph of Maximum Transient Duration vs. Reset
Threshold Overdrive for which reset is not asserted.
The graph was produced using negative-going V CC
pulses, starting at V CC and ending below the reset
threshold by the magnitude indicated (reset threshold
overdrive). The graph shows the maximum pulse width
that a negative-going V CC transient can typically have
without triggering a reset pulse. As the amplitude of the
transient increases (i.e., goes further below the reset
threshold), the maximum allowable pulse width
decreases. Typically, a V CC transient that goes 100mV
below the reset threshold and lasts for 30μs will not
trigger a reset pulse.
A 0.1μF bypass capacitor mounted close to the V CC
pin provides additional transient immunity.
WDI
t RP
t WD
RESET
t WD = WATCHDOG TIMEOUT PERIOD
t RP = RESET TIMEOUT PERIOD
Figure 1. MAX6362 Watchdog Timeout Period and Reset Active Time
t WD
t RP
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